Samba Security Update

Number: AV17-073
Date: 25 May 2017

Purpose

The purpose of this advisory is to bring attention to the recently released security update for Samba.

Assessment

Samba has released version 4.7.5 that contains security fixes to address a vulnerability.  Exploitation of this vulnerability could allow a malicious client to upload a shared library to a writable share, and then cause the server to load and execute it.

Affected Versions:

CVE Reference: CVE-2017-7494

Special consideration and review should be conducted for internet connected devices which may be leveraging vulnerable versions of Samba, including but not limited to: DVRs, routers and IP cameras.  These types of devices typically can only be updated via vendor released firmware updates.

Suggested action

CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly or workarounds to affected platforms accordingly.

References

https://lists.samba.org/archive/samba-announce/2017/000406.html
https://www.samba.org/samba/security/CVE-2017-7494.html

Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.
http://www.publicsafety.gc.ca/cnt/ntnl-scrt/cbr-scrt/_fl/CCIRCPublicPGPKey.txt

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589
E-mail: ps.communications-communications.sp@canada.ca

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